In indexing, each item is recognized by an item number also known as the index. For reading data from RAM, we use direct access method. As operating system knows all the indexes stored in the RAM, it can access data directly. Indirect memory access we need extra memory for storing index locations, header, footer etc. Old windows operating systems use sequential programming in networks.
Direct access to networks was first time introduced in windows server , then in Windows 7 and Windows 8. Old tape drives use sequential access while hard drives use direct access to read and write to files. Skip to content. Change Language. Related Articles. Table of Contents. Improve Article. Save Article. Like Article. Prerequisite — File Systems When a file is used, information is read and accessed into computer memory and there are several ways to access this information of the file.
Some systems provide only one access method for files. Other systems, such as those of IBM, support many access methods, and choosing the right one for a particular application is a major design problem.
But why is sequential access so bad? Simply because it forces the user to work harder than she needs to: she has to process all the content that sequentially precedes the piece of information that she is interested in. Thus, sequential access increases interaction cost. The benefits of sequential access are more hoped-for than they are real on most practical websites.
In contrast, the costs are very real and are incurred every time. The carousel has always been a popular way to stick content on the front page without taking up too much space and has seen a resurgence with the advent of the iPad. Original iPad designs were fascinated by the etched screen aesthetic and wanted to control the layout in the tiniest detail. As a result they often forewent vertical scrolling in favor of a card or carousel-like design.
Carousels have many advantages , but one big disadvantage is that they are based on sequential access: users must go through all the items in the carousel one by one in order to get to the last one. This interaction is inefficient and provides little information scent : users generally have no information about what comes next. Although carousels may solve content-priority quarrels within the organization, they slow users down at least in their more traditional incarnations.
How can you make carousels more direct-access like? If you cannot avoid them altogether, provide links to the stories in the carousels to let people select them in any order or, at least, present more than one item at once. Also, remember that carousels are ok only for short lists: users should be able to get to the last item in the list in 3—4 steps.
Even more than books, videos are the sequential-access medium par excellence: users must patiently watch a lot of video footage before getting to a piece of content that is relevant or interesting to them. That is why videos by themselves are not an ideal medium for instructional or informational content; although they can work great in conjunction with text, if they are the only method available to users, they are terribly inefficient.
How can we fix them? For most modern purposes, this will be random access, although for backup archives that are rarely needed, tape drives might be optimal. Skip to content. Difference between Sequential and Random Access Files When we are talking about sequential or random access to data files we refer to the way data is written or read from a file on a computer system.
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